Then Harbonah, one of the eunuchs attending the king, said: “There is a gallows fifty cubits high at Haman’s house. He had it built for Mordecai, who gave the report that saved the king.” “Hang him on it!” declared the king.
Jewish Publication Society of America Version (JPS1917) - Esther 7:9 >Then said Harbonah, one of the chamberlains that were before the king: 'Behold also, the gallows fifty cubits high, which Haman hath made for Mordecai, who spoke good for the king, standeth in the house of Haman.' And the king said: 'Hang him thereon.'